The Italian Billionaire's Secretary Mistress: Harlequin comics

Secretary Angie has secretly been in love with her boss, Riccardo, for years. But Riccardo is rich and incredibly handsome. There is no way a man who dates beautiful woman after beautiful woman would ever notice plain old Angie. Just as Angie resolves to move on from her painful one-sided love, Riccardo suddenly gives her a red dress to wear to the office Christmas party. Though hesitant, Angie appears at the party all dolled up, only for Riccardo to give her a fiery look and shoot icy, accusing words: "What are you trying to do?"